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Mastering Development

Hierarchical input select

Could you please help me solving an issue related to Hierarchical input select. I build a simply app for hierarchical input selecting, where the choices of each selectInput are updating based on the previous user selection. The app works, but I have found some strange behavior, which I want to avoid if possible. My first […]

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Mastering Development System & Network

PHP Warning: PHP Startup: imagick: Unable to initialize module

I am getting following error when installed with lib imagick, but able to see the imagick module. Could you please check and help to resolve the issue without uninstalling the imagick module. Thank you Error: php_errors.log:[22-Jun-2020 17:40:47 UTC] PHP Warning: PHP Startup: imagick: Unable to initialize module php_errors.log:Module compiled with module API=20100525 php_errors.log:PHP compiled with […]

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Artificial Intelligence (AI) Mastering Development

A good machine learning approach for distribution of a whole?

So I had done with different classification, regression and clustering approaches for predictions of values etc. I was wondering if there is a machine learning approach for distribution of a whole based on on some features (I do not know if there is an approach for that I just could not find one with my […]

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Mastering Development

Uploading a CSV to Plotly Dash and rendering a bar plot based on a Pandas dataframe

I’m new to the Plotly Dash framework and have attempted to build a simple dashboard that: Allows the user to upload a CSV file to analyze graphically. Creates a Pandas data frame based on the file uploaded in step #1. 2a. Renders nothing if the CSV file (and resulting data frame) has not been selected. […]

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Mastering Development

R round number to different number of digits based on value on multiple columns

I’m trying to round numbers in multiple columns using different thresholds based on the value. Specifically, I want to round to an integer if the absolute value is larger than 1 and round to the third decimal point if not. I’ve tried a few different strategies by following answers to similar questions but doesn’t seem […]

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Mastering Development

Can we neatly align the regression equation and R2 and p value?

What is the best (easiest) approach to add neatly to a ggplot plot the regression equation, the R2, and the p-value (for the equation)? Ideally it should be compatible with groups and faceting. This first plot with has the regression equation plus the r2 and p-value by group using ggpubr, but they are not aligned? […]

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Mastering Development

Check if a URL is a video URL or PHOTO URL

I have a textview in which a user is supposed to enter a url. First I am checking the validity of the URL. Once the validity is confirmed, I need to check if It’s a video url or photo url. I have two arrays of all possible video (MP4, MOV etc) and photo (JPG, PNG) […]

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Mastering Development

data.table – split data.table into elements of a lists using ~ var|factor – cast / dcast

I have a large data.table which I am using for subsequent analysis on different levels of the data. In order to avoid repetitive code, I would like to break my data.table into smaller chunks and save them as (elements of) lists. Couple of days ago I have seen a post where something like this was […]

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Linux Mastering Development Ubuntu

Error on videos (.mkv) after software upgrade

My system: Laptop Dell inspiron 15 3000 RAM: 16 GB SSD 480 GB Kingston Intel Core i3 7th Generation OS: Ubuntu 18.04 with Software and System Updates Web Browser: Mozilla Firefox, Google Chrome, Palemoon. All latest. Terminal emulator: Yakuake, gnome-terminal. Other Terminal: TTY1 Internet service provider connection speed: 100 Mbps (asymmetric) The upgrade Just recently […]

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Development

A simple reproducible example to pass arguments to data.table in a self-defined function in R

I have been googling this answer for a few hours. A lot of people have asked similar questions, but I did not find either a simple enough question or a straightforward answer. Here is my approach: Assume that I want to do a simple group by in data.table: library(data.table) mtcars = data.table(mtcars) mtcars[,sum(mpg), gear] # […]